# Lupus Tracker vs Gretl

The clearest difference is review sentiment: Gretl at 100% against Lupus Tracker's 0%. Gretl also leads on rating (5.0 vs 3.9) and update cadence (every 4 days vs every 4 months). Lupus Tracker's advantage is ratings volume (21 vs 2) and device support (4 vs 2). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Lupus Tracker sells 14 in-app purchases, starting at $4.95 per month and Gretl sells 2 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.

Gretl holds the better App Store score, 5.0 against 3.9. That said, the two scores are not equally well evidenced: Lupus Tracker has 21 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 0% of Lupus Tracker's written reviews are positive against 100% of Gretl's.

Lupus Tracker ships an update every 4 months, Gretl every 4 days. The most recent releases landed on October 24, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Lupus Tracker | Gretl |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.9 (21 ratings)](https://appshunter.io/ios/app/lupus-tracker/id6743565180/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/gretl-macro-coach/id6760969454/reviews)** |
| Number of ratings | **21** | 2 |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 4 days** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 219 MB | 72 MB |
| Requires iOS | **15.5** | 16.4 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, Apple Watch |
| Age rating | 4+ | 17+ |
| Developer | [Digital Therapeutics](https://appshunter.io/developer/1721663167) | [Andr3s LLC](https://appshunter.io/developer/1887086758) |

## What reviewers say

### Lupus Tracker

[App page](https://appshunter.io/ios/app/lupus-tracker/id6743565180)

This app helps individuals manage lupus by tracking symptoms, medications, and potential triggers. It visualizes patterns to aid in understanding flares and improving communication with healthcare providers. Supports various lupus types and related autoimmune conditions.

**Highlights:** Symptom tracking with severity and notes, Medication reminders and adherence tracking, Flare tracking with triggers and dates, Apple Health integration for biometrics, Report generation for doctor visits, Multi-profile support for caregivers

**Features:** macOS Compatibility, Siri integration, Apple Watch app, iMessage stickers, Vision Pro support

**In-app purchases (14)**

| Purchase | Price | Billing |
| --- | --- | --- |
| flex pass | $4.95 | per month |
| easy pass | $5.99 | per 7 days |
| flex pass | $8.99 | per month |
| weather max | $9.99 | per 3 months |
| yearly access | $19.99 | per year |
| smart pass | $24.99 | per year |
| Premium Yearly | $29.99 | per year |
| limited sale | $29.99 | per year |
| limited discount | $34.99 | per year |
| Extended Trial | $39.99 | per year |
| yearly access | $39.99 | per year |
| 7-Day Trial | $49.99 | per year |
| store credit | $1.99 | one-time |
| lifetime upgrade | $119.99 | one-time |


### Gretl

[App page](https://appshunter.io/ios/app/gretl-macro-coach/id6760969454)

This app acts as a personal health coach, focusing on trends rather than daily judgments. It allows users to log meals in plain language or by photo, automatically calculating calories and macros. It provides gentle, optional coaching and tracks various health metrics without shame or guilt.

**Highlights:** Log meals in plain words or by photo, Automatic calorie and macro calculation, Trend-based health tracking, Optional personalized coaching, Track weight, workouts, water, and cholesterol, Voice logging on smartwatches, Private by design with data export

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gretl Pro Monthly | $7.99 | per month |
| Gretl Pro Yearly | $34.99 | per year |


## Frequently asked questions

### Is Lupus Tracker free?

Lupus Tracker is free to download, with in-app purchases available.

### Is Gretl free?

Gretl is free to download, with in-app purchases available.

### Which has better reviews, Lupus Tracker or Gretl?

Gretl is rated higher. Lupus Tracker averages 3.9 out of 5 from 21 ratings, while Gretl averages 5.0 from 2 ratings.

### Do Lupus Tracker or Gretl have ads?

Neither Lupus Tracker nor Gretl shows ads.

### Which is updated more often, Lupus Tracker or Gretl?

Lupus Tracker ships an update every 4 months, and Gretl every 4 days. Most recently, Lupus Tracker was updated on October 24, 2026 and Gretl on October 8, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*